The now outdated WinSCP plugin refuses to connect to most current servers because of the potentially insecure key exchange algorithm, as described here:
https://forum.altap.cz/viewtopic.php?t=44007
I'm the (former paying) Salamander user for about 20 years, and this problem is pretty much the only one that gives me a headache.
As far as I'm concerned, Salamander would still be perfect in 2024 if the WinSCP plugin was up to date.